void G1MarkSweep::mark_sweep_phase3() {

  {- -------------------------------------------
  (1) (変数宣言など)
      ---------------------------------------- -}

      G1CollectedHeap* g1h = G1CollectedHeap::heap();
      Generation* pg = g1h->perm_gen();

  {- -------------------------------------------
  (1) (トレース出力)
      ---------------------------------------- -}

      // Adjust the pointers to reflect the new locations
      EventMark m("3 adjust pointers");
      TraceTime tm("phase 3", PrintGC && Verbose, true, gclog_or_tty);
      GenMarkSweep::trace("3");

  {- -------------------------------------------
  (1) (変数宣言など)
      ---------------------------------------- -}

      SharedHeap* sh = SharedHeap::heap();

  {- -------------------------------------------
  (1) まず, strong root 内に格納されているポインタの修正処理を行う.
      ---------------------------------------- -}

      sh->process_strong_roots(true,  // activate StrongRootsScope
                               true,  // Collecting permanent generation.
                               SharedHeap::SO_AllClasses,
                               &GenMarkSweep::adjust_root_pointer_closure,
                               NULL,  // do not touch code cache here
                               &GenMarkSweep::adjust_pointer_closure);

      g1h->ref_processor()->weak_oops_do(&GenMarkSweep::adjust_root_pointer_closure);

  {- -------------------------------------------
  (1) 
      ---------------------------------------- -}

      // Now adjust pointers in remaining weak roots.  (All of which should
      // have been cleared if they pointed to non-surviving objects.)
      g1h->g1_process_weak_roots(&GenMarkSweep::adjust_root_pointer_closure,
                                 &GenMarkSweep::adjust_pointer_closure);

  {- -------------------------------------------
  (1) MarkSweep::adjust_marks() を呼んで, 
      MarkSweep::preserve_mark() で待避された mark 値内のポインタについても, 値を修正しておく.
      (See: PreservedMark)
      ---------------------------------------- -}

      GenMarkSweep::adjust_marks();

  {- -------------------------------------------
  (1) G1CollectedHeap::heap_region_iterate() を呼んで, HeapRegion 内のポインタを修正する.
      ---------------------------------------- -}

      G1AdjustPointersClosure blk;
      g1h->heap_region_iterate(&blk);

  {- -------------------------------------------
  (1) CompactingPermGenGen::adjust_pointers() で, Perm 領域のポインタを修正する.
      ---------------------------------------- -}

      pg->adjust_pointers();
    }